Laser Beacon Detection Using Focal Plane Array Hotspot Tracking
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Solution Overview
Problem
Current wireless radio communication technologies face challenges such as signal attenuation and interference due to geographic dispersion, limited frequency bands, and security concerns, while laser communication offers high-speed and secure alternatives but requires precise identification and alignment of laser sources, which can be hindered by atmospheric effects and mechanical instabilities.
Innovation Solution
A method and apparatus using a focal plane array to rapidly recognize and distinguish laser communication signals by analyzing light sources within a scene, employing overlapping beam components at different wavelengths, edge detection, and pixel averaging to identify hotspots, and comparing them with a laser signal table to verify and record candidate laser signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser communication is used to achieve high-speed and secure communication, then data transfer speed and security are improved, but the requirement for precise identification and alignment of laser sources increases complexity
Solution Approach 1:
The patent segments the laser source identification process into distinct stages: initial scene scanning to detect candidate light sources, followed by acquisition phase to establish communication. This segmentation allows the system to handle the complex identification task in manageable steps, reducing overall system complexity while maintaining high data transfer speeds.
Solution Approach 2:
The patent implements preliminary action by performing scene scanning and candidate light source identification before the actual communication acquisition. The system pre-identifies and catalogs potential laser sources, their positions, and characteristics in advance, so that when communication is needed, the alignment process can begin immediately without delay, thus maintaining high productivity while managing complexity.
2Ease of operation
If traditional radio communication is used, then ease of operation is maintained, but signal attenuation and interference due to geographic dispersion reduce reliability
Solution Approach 1:
The patent extracts the beam alignment and tracking function as a separate, dedicated subsystem within the laser communication system. This extraction allows the system to maintain ease of operation for end users while the specialized alignment subsystem handles the complex task of maintaining reliable signal transmission through automatic tracking and adjustment, thus resolving the contradiction between operational simplicity and transmission reliability.
3Reliability
If frequency bands are assigned to laser communication users, then interference between beams is avoided, but the limited supply of frequency bands restricts adaptability
Solution Approach 1:
The patent applies parameter changes by utilizing different wavelengths (a parameter of light) for different laser communication beams instead of relying on a limited set of assigned frequency bands. This approach maintains reliable interference avoidance while significantly increasing adaptability, as the system can dynamically select from a much broader spectrum of optical wavelengths rather than being constrained to predefined radio frequency bands.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables rapid and reliable identification of laser communication signals, reducing unnecessary consideration of non-relevant light sources and maintaining alignment, thus enhancing the reliability and security of laser communication systems, particularly in satellite communications.
Implementation Method 1
A rapid and reliable apparatus and method are disclosed for recognizing and distinguishing light sources within a scene that are candidate laser communication signals
Data Source
AI summary
A disclosed apparatus and method detect light source “hotspots” and recognize laser communication signals within a scene, while minimizing repeat consideration of previously detected light sources. Local maxima are identified in pixel frames from a focal plane array (FPA), and compared with a table of previous detections. FPA frames can be used directly for hotspot detection, or successive FPA frames can be subtracted for edge detection. Most recent detection frame numbers, coordinates, signal values, and/or other information can be updated in the table upon repeat detection of a hotspot. Source identifying information can be included in the table for entries that are identified as laser communication signals. Source identifying features can be evaluated so that only signals of interest are saved in the table. Hotspots that remain undetected after a designated number of frames can be deleted from the table.